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TNPCB Notice to Tata Electronics: TDS Levels of 2,450 mg/L Exceed Norms in Hosur, Tamil Nadu

Target:UPSC GS-IIIMPSCTeachingSSC GAPrelims HighMains HighStatic GK Link
21 Jun 2026
~2 min
Source: The Hindu
Key Data:TDS 2,450 mg/LBOD 78 mg/LCOD 160 mg/LPermissible TDS 1,000 mg/LETP capacity 60 kilolitresTrade effluent up to 100 kilolitres
Bodies:Tamil Nadu Pollution Control Board (TNPCB)Tata Electronics Private Limited (TEPL)
Practice MCQs from today's news ▸
What This Article Covers

1.TNPCB issued show-cause notice to Tata Electronics in May 2026 after water samples from percolation ponds showed TDS of 1,916–2,450 mg/L against permissible limit of 500–1,000 mg/L.

2.Farmers report crop failure and low yields; water samples from farm wells had TDS >1,500 mg/L, affecting soil fertility and causing skin irritation.

3.Allegations that the Zero Liquid Discharge plant bypasses ETP at high production, mixing trade effluent with STP discharge to dilute TDS levels, undermining environmental compliance.

The Big Picture
Prelims · HighMains · High

Farmers in Hosur allege Tata Electronics iPhone plant discharged chemical effluents into farmland, contaminating groundwater. TNPCB found TDS up to 2,450 mg/L (limit 1,000), BOD/COD far exceeding norms. Raises questions about Zero Liquid Discharge compliance, industrial regulation, and farmer livelihoods — crucial for GS3 (Environment, Agriculture, Governance).

Exam Lens

Quick Exam Facts From News

TDS in pond samples1,916 – 2,450 mg/L
Permissible TDS normNot above 1,000 mg/L (or <500 ppm)
BOD range12 – 78 mg/L (limit <30 mg/L)
COD range48 – 160 mg/L (limit <30 mg/L)
Notice issued byTamil Nadu Pollution Control Board (TNPCB)
Date of noticeMay 2026
Plant locationNagamangalam, Hosur, Krishnagiri, Tamil Nadu
Production capacity (Phase I expansion)3.74 crore metal cases for iPhones per annum

1-Minute Revision

  • ›TDS in pond samples: 1,916 – 2,450 mg/L
  • ›Permissible TDS norm: Not above 1,000 mg/L (or <500 ppm)
  • ›Target this Data: TDS of 2,450 mg/L vs norm of 1,000 mg/L for percolation ponds
  • ›Target this Nodal Body: Tamil Nadu Pollution Control Board (TNPCB)
  • ›Target this Concept: Zero Liquid Discharge (ZLD) / Multiple Effect Evaporator (MEE)

Mastered this topic? Test your knowledge with a full MCQ quiz.

Practice exam-style questions, track your score, and strengthen your recall.

Q1Static LinkageEasy

Which regulatory body issued the show-cause notice to Tata Electronics for alleged effluent discharge in Hosur?

Q2Statement-basedHard

Consider the following statements regarding the Tata Electronics plant controversy:

1. The TDS levels found in the plant's percolation ponds ranged between 1,916 mg/L and 2,450 mg/L.

2. The permissible limit for TDS in percolation ponds is not above 500 ppm, which is more stringent than the 1,000 ppm limit mentioned.

3. The plant uses a Zero Liquid Discharge system with RO, MEE, and ATFD to treat trade effluent.

Which of the statements given above is/are correct?

Q3Data-centricMedium

What was the maximum Total Dissolved Solids (TDS) value recorded in water samples from the percolation ponds of the Tata Electronics plant?

Q4Application/ImpactMedium

What is the primary impact of high TDS levels in irrigation water on agricultural productivity, as evidenced in the news article?

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